Imagine trying to understand a giant family tree with hundreds of relatives, all listed one after another. Or picture a company with thousands of employees, and you need to see who reports to whom. Our world is full of information that connects in complex, branching ways.

Making sense of this kind of data can feel impossible. It's like trying to see the whole forest when you are standing right in front of a single tree. For a long time, people struggled with how to show these complicated relationships clearly.